Process for obtaining luster and matte effects on yarns or fabrics composed wholly or in part of viscose in the sulphur state



Nl TED s'r A I 1,724,75- PAEN FFICE.

FRED SCHLOEFIELD AND NORMAN DENNER, OF WALKDFN, EN GLAND, ASSIGNORS T BURGESS LEDWARD & COMPANY LIMITED, OF MANCHESTER, ENGLAND.

PROCESS FOR OBTAINTNG LUSTER AND MATTE EFFECTS ON YARNS 0R FABRICS COMPOSED WHOLLY OR IN PART OF VISCOSE IN THE SULPHUR STATE.

No Drawing. Application filed June 1, 1926, Serial No. 113,102, and in Germany July 21, 1925.

of luster and matte effects on yarns composed wholly or in part of viscose artificial silk and on fabrics knitted or woven wholly or in part from such yarns.

According to the present inventlon a desulphurizing agent is applied locally to the yarn or fabric whilst the yarn or fabric is in the sulphur state, i. e. before it has been de- 10 sulphurized, the yarn or fabric being then subsequently washed or otherwise treated,

the portion of the yarn or fabric to which the desulphurizing agent has been applied having a high luster and the portion to which it has not been applied having a dull or matte appearance.

The desulphurizing agent can be applied to the surface of the yarn or fabric in any desired way such as by printing rollers, blocks, stencils, or spraying nozzles and may be applied-in the form of a pastewith or without a suitable dyestuff or if desired it may be incorporated with a colour discharging paste and soapplied tothe fabric after the latter has been dyed whereby luster and matte colour discharge eflect are obtained. The usual desulphurizing agent-sodium sulphide-has a very deleterious effect on copper and should not be employed where the paste containing'the agent is appliedto the fabric by engraved copper printing rollers. In such case it is advisable to use sodium sulphite, potassium sulphite, ammonium sulphite, calcium sulphite or other desulphurizing agent which will have little or no effect on the rollers. Moreover, it is difficult or impossible to cause sodium sulphide to function in a printing paste with dyestuffs other than the sulphur colours and where a printing aste containing other dyestuffs is emplo ed it is also necessary to use sodium sulp ite, potassium sulphite, ammonium sulphite, calcium sulphite or other desulphurizing agent which will function with the dyestuffs.

In carrying out the invention to produce a luster and matte effect without colour a paste is formed of sodium sulphite made to the desired viscosity with gum, glycerine or other assistants. The paste is applied to the yarn or fabric by printing rollers, blocks or stencils and the yarn or fabric is then dried, steamed, rinsed and finally dried. "The sodium sulphite maybe replaced by sodium sulphide if copper printing rollers are not employed.

To produce a luster and matte effect with a coloured pattern the yarn or fabric is A, printed in the usual way by engraved rollers,

blocks or stencils .with a paste made to the desired viscoslty with gum, glycerine or other as'slstants and containing the desired colour to which sodium sulphite has been added. The yarn or fabric being afterwards" dried, steamed, rinsed, soapedif necessary, and finally dried.

Luster and matte colour discharge effects on dyed yarn or fabric are produced in a similar way by using a printing paste contalning sodium sulphite or other suitable soluble sulphite and a colour discharging paste such as a formaldehyde hydrosulphite or a formaldehyde zinc hydrosulphite, the

yarn or fabric being afterwards dried,

steamed, rinsed, soaped if necessary and finally dried.

By so prlnting with a paste containing desulphurizing agent and if required a dyestuff or a colour discharging agent a very fine luster and matte effect is obtained in a simple operation, and new and complex designs can be produced quickly and cheaply.

To obtain such designs by methods hitherto employed would entail much trouble and expense,,and the effects produced would not compare favourably with effects produced by the processes described above.

The following examples illustrate suitable pastes for the printing of designs with direct colours, basic colours and vat colours, respectively.

Direct colours printed with a paste (dissolved in a steamed, rinsed and finally dried.

Basic colours.

The yarn or fabric is impregnated with 5% tannic acid solution for about hour, .dried and printed with a paste made up .5 with 2 lbs. acridine orange RS (Schultz-Julius No. 602). r 28 lbs. water. 60 lbs. British gum. p 10 lbs. sodium sulphitev (or other sulphite which acts as a desulphurizing agent).

The yarn or fabric is then steamed for an hour and the colour fixed by impregnating the fabric with a 25% solution of tarter l5 emetic and then washed, soaped and dried.

Vat colours.

orange benzyl sul- 4 lbs. formosal and suflicient British gum paste to ensure the correct viscosity.

. After printing, the yarn or fabric is dried, steamed for 10 minutes, soaped and dried.

What we claim as our invention and desire to protect by Letters Patent is 1. The production of matte and luster effects on yarns and fabrics of the type referred to by the application of a printing paste containing sodium sulphite and a dyestufi locally to parts of the material while the latter is in the sulphur state.

2. The production of matte and luster effects on yarns of viscose artificial silk and a' fabric produced therefrom whilst in the sulphur state by printing thereon with a printing paste containing sodium sulphite and a dye'stuff and subsequently drying, steaming, rinsing, and finallydrying.

3. Yarns and fabrics formed from viscose I artificial silk yarn in the sulphur state having luster and matte eflects produced thereon by the application locally of sodium sulphite and a dyestuff.

In testimony whereof we have hereunto set our hands this 20th day of May, 1926.

F. SCHOLEFIELD. N DENNER. 

